There are two parts to this. First, what is the ideal amount of crime? It's not zero. Zero-crime is a police state. The people must have some power to inflict

There are two parts to this. First, what is the ideal amount of crime? It's not zero. Zero-crime is a police state. The people must have some power to inflict damage on the government and elements of society. I think it would be rather difficult to conduct the civil rights movement today. Monitoring protests and targeting not just the leaders but even the participants is just too easy now. Second, parallel construction is the most corrosive concept to ever enter US law enforcement. It completely runs around the "fruit of the poisonous tree" doctrine. When the DEA gets a tip-off from the NSA, that obviously illegal abuse of power never gets a debate in a court-room, because a "routine police stop" lucked upon the evidence.